SPIN DENSITY WAVES IN AN ELECTRON GAS
SPIN DENSITY WAVES IN AN ELECTRON GAS
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DOI：
10.1103/physrev.128.1437
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发表时间：
1962-01-01
期刊：
影响因子：
--
通讯作者：
OVERHAUSER, AW
中科院分区：
文献类型：
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作者：
OVERHAUSER, AW
严格地证明了电子气的顺磁态永远不是Hartree-Fock基态，即使在高密度或弱相互作用极限下也是如此。顺磁态对于静态自旋密度波的形成总是不稳定的。不稳定性发生在自旋密度波具有波矢Q = 2 k F，费米球的直径。由此可见，顺磁态的（Hartree-Fock）自旋磁化率并不是随Q增大而单调递减的函数，而是在Q= 2kF附近具有奇异性的函数.总结了铬的反铁磁基态是大振幅自旋密度波态的较有说服力的实验证据。讨论了这种状态的一些后果，包括用中子衍射检测它们的问题。
It is shown rigorously that the paramagnetic state of an electron gas is never the Hartree-Fock ground state, even in the high-density—or weak-interaction—limit. The paramagnetic state is always unstable with respect to formation of a static spin density wave. The instability occurs for spin-density waves having a wave vector Q≈ 2 k F, the diameter of the Fermi sphere. It follows that the (Hartree-Fock) spin susceptibility of the paramagnetic state is not a monotonic decreasing function with increasing Q, but rather a function with a singularity near Q= 2 k F. Rather convincing experimental evidence that the antiferromagnetic ground state of chromium is a large-amplitude spin density wave state is summarized. A number of consequences of such states are discussed, including the problem of detecting them by neutron diffraction.